... elbows:ISO 9001CERTIFICATE.1. BUTT WELDED FITTING:2. Production acc. to the standard of GB /ASTM / ASME / DIN / JISASTM B 16.9 ... . Types: Elbows, seamless and welded, LR & SR ,Bend -Equal and reducing Tees,seamless and welded - Concentric and eccentric Reducers,seamless and welded -Caps,4. Wall ...